Abstract
The microwave induced argon plasma was applied to the preparation of NaOH-activated carbon from sugar cane bagasse. The distinguished feature of the heating technique with this cold plasma is the short operation time. The carbonization and the activation process were finalized in one step within 3 min. The prepared activated carbon with NaOH ratio 3 to bagasse characterized using N2 adsorption of type IV (IUPAC classification) to give specific surface area of 1980 m2/g and mesopore volume of 0.73 ml/g. It also showed a higher specific capacitance of 201 F/g in 1 M H2SO4 solution (with standard three electrodes) than the corresponding one by the conventional heating, previously reported. The other features were the absence of oxygen groups and the presence of carbon centered stable radicals, detected by ESR spectra, on the surface.
Highlights
IntroductionThe preparation of activated carbon from waste biomass has a long history [1]-[8], but still attracting attentions from various ecological standpoints of view [9] [10] [11] and being reviewed [12]
The preparation of activated carbon from waste biomass has a long history [1]-[8], but still attracting attentions from various ecological standpoints of view [9] [10] [11] and being reviewed [12]. It has been reported from this laboratory that the decomposition of such biomass as sugar cane bagasse/sawdust [13] or cellulose/lignin [14] with argon plasma induced by microwave irradiation afford effectively the mixture
Comparing with our previous studies on the NaOH-activated carbon from sugar cane bagasse with the conventional heating being conducted in two steps, carbonization and activation [5] [15], the present process using plasma heating showed a comparable surface area within a very short operation time of carbonization and activation
Summary
The preparation of activated carbon from waste biomass has a long history [1]-[8], but still attracting attentions from various ecological standpoints of view [9] [10] [11] and being reviewed [12]. It has been reported from this laboratory that the decomposition of such biomass as sugar cane bagasse/sawdust [13] or cellulose/lignin [14] with argon plasma induced by microwave irradiation afford effectively the mixture (syngas). The superiority of the incidental energy consumption per specific surface area of the activated carbon by the plasma heating over the ordinary heating was elucidated in this report
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